C2CD4A and mastitis: Only 2.6 kb upstream of this SNP was the location of the reverse-orientated LOC529823 gene that encodes C2 calcium-dependent domain-containing protein 4A, while further on in the distance of 19.8 kb was the forward-orientated gene VPS13C that encodes vacuolar protein sorting 13 homolog C. The frequency of this SNP in mastitis-affected cows was 0.09, whereas in healthy cows, it was 0.844.